sysdeps/unix/sysv/linux/netinet/in.h

   1 /* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #ifndef _NETINET_IN_H
  20
  21 #define _NETINET_IN_H   1
  22 #include <features.h>
  23
  24 #include <sys/socket.h>
  25 #include <sys/types.h>
  26
  27
  28 __BEGIN_DECLS
  29
  30 /* Standard well-defined IP protocols.  */
  31 enum
  32   {
  33     IPPROTO_IP = 0,      /* Dummy protocol for TCP.  */
  34     IPPROTO_ICMP = 1,    /* Internet Control Message Protocol.  */
  35     IPPROTO_IGMP = 2,    /* Internet Group Management Protocol. */
  36     IPPROTO_IPIP = 4,    /* IPIP tunnels (older KA9Q tunnels use 94).  */
  37     IPPROTO_TCP = 6,     /* Transmission Control Protocol.  */
  38     IPPROTO_EGP = 8,     /* Exterior Gateway Protocol.  */
  39     IPPROTO_PUP = 12,    /* PUP protocol.  */
  40     IPPROTO_UDP = 17,    /* User Datagram Protocol.  */
  41     IPPROTO_IDP = 22,    /* XNS IDP protocol.  */
  42     IPPROTO_IPV6 = 41,   /* IPv6-in-IPv4 tunnelling.  */
  43     IPPROTO_ICMPV6 = 58, /* ICMPv6.  */
  44
  45     IPPROTO_RAW = 255,   /* Raw IP packets.  */
  46     IPPROTO_MAX
  47   };
  48
  49 /* Standard well-known ports.  */
  50 enum
  51   {
  52     IPPORT_ECHO = 7,            /* Echo service.  */
  53     IPPORT_DISCARD = 9,         /* Discard transmissions service.  */
  54     IPPORT_SYSTAT = 11,         /* System status service.  */
  55     IPPORT_DAYTIME = 13,        /* Time of day service.  */
  56     IPPORT_NETSTAT = 15,        /* Network status service.  */
  57     IPPORT_FTP = 21,            /* File Transfer Protocol.  */
  58     IPPORT_TELNET = 23,         /* Telnet protocol.  */
  59     IPPORT_SMTP = 25,           /* Simple Mail Transfer Protocol.  */
  60     IPPORT_TIMESERVER = 37,     /* Timeserver service.  */
  61     IPPORT_NAMESERVER = 42,     /* Domain Name Service.  */
  62     IPPORT_WHOIS = 43,          /* Internet Whois service.  */
  63     IPPORT_MTP = 57,
  64
  65     IPPORT_TFTP = 69,           /* Trivial File Transfer Protocol.  */
  66     IPPORT_RJE = 77,
  67     IPPORT_FINGER = 79,         /* Finger service.  */
  68     IPPORT_TTYLINK = 87,
  69     IPPORT_SUPDUP = 95,         /* SUPDUP protocol.  */
  70
  71
  72     IPPORT_EXECSERVER = 512,    /* execd service.  */
  73     IPPORT_LOGINSERVER = 513,   /* rlogind service.  */
  74     IPPORT_CMDSERVER = 514,
  75     IPPORT_EFSSERVER = 520,
  76
  77     /* UDP ports.  */
  78     IPPORT_BIFFUDP = 512,
  79     IPPORT_WHOSERVER = 513,
  80     IPPORT_ROUTESERVER = 520,
  81
  82     /* Ports less than this value are reserved for privileged processes.  */
  83     IPPORT_RESERVED = 1024,
  84
  85     /* Ports greater this value are reserved for (non-privileged) servers.  */
  86     IPPORT_USERRESERVED = 5000
  87   };
  88
  89
  90 /* Internet address.  */
  91 struct in_addr
  92   {
  93     unsigned int s_addr;
  94   };
  95
  96
  97 /* Definitions of the bits in an Internet address integer.
  98
  99    On subnets, host and network parts are found according to
 100    the subnet mask, not these masks.  */
 101
 102 #define IN_CLASSA(a)            ((((unsigned) (a)) & 0x80000000) == 0)
 103 #define IN_CLASSA_NET           0xff000000
 104 #define IN_CLASSA_NSHIFT        24
 105 #define IN_CLASSA_HOST          (0xffffffff & ~IN_CLASSA_NET)
 106 #define IN_CLASSA_MAX           128
 107
 108 #define IN_CLASSB(a)            ((((unsigned) (a)) & 0xc0000000) == 0x80000000)
 109 #define IN_CLASSB_NET           0xffff0000
 110 #define IN_CLASSB_NSHIFT        16
 111 #define IN_CLASSB_HOST          (0xffffffff & ~IN_CLASSB_NET)
 112 #define IN_CLASSB_MAX           65536
 113
 114 #define IN_CLASSC(a)            ((((unsigned) (a)) & 0xc0000000) == 0xc0000000)
 115 #define IN_CLASSC_NET           0xffffff00
 116 #define IN_CLASSC_NSHIFT        8
 117 #define IN_CLASSC_HOST          (0xffffffff & ~IN_CLASSC_NET)
 118
 119 #define IN_CLASSD(a)            ((((unsigned) (a)) & 0xf0000000) == 0xe0000000)
 120 #define IN_MULTICAST(a)         IN_CLASSD(a)
 121
 122 #define IN_EXPERIMENTAL(a)      ((((unsigned) (a)) & 0xe0000000) == 0xe0000000)
 123 #define IN_BADCLASS(a)          ((((unsigned) (a)) & 0xf0000000) == 0xf0000000)
 124
 125 /* Address to accept any incoming messages.  */
 126 #define INADDR_ANY              ((unsigned) 0x00000000)
 127 /* Address to send to all hosts.  */
 128 #define INADDR_BROADCAST        ((unsigned) 0xffffffff)
 129 /* Address indicating an error return.  */
 130 #define INADDR_NONE             ((unsigned) 0xffffffff)
 131
 132 /* Network number for local host loopback.  */
 133 #define IN_LOOPBACKNET  127
 134 /* Address to loopback in software to local host.  */
 135 #ifndef INADDR_LOOPBACK
 136 #define INADDR_LOOPBACK ((unsigned) 0x7f000001) /* Inet address 127.0.0.1.  */
 137 #endif
 138
 139
 140 /* IPv6 address */
 141 struct in6_addr
 142   {
 143     union
 144       {
 145         u_int8_t        u6_addr8[16];
 146         u_int16_t       u6_addr16[8];
 147         u_int32_t       u6_addr32[4];
 148 #if (~0UL) > 0xffffffff
 149         u_int64_t       u6_addr64[2];
 150 #endif
 151       } in6_u;
 152 #define s6_addr                 in6_u.u6_addr8
 153 #define s6_addr16               in6_u.u6_addr16
 154 #define s6_addr32               in6_u.u6_addr32
 155 #define s6_addr64               in6_u.u6_addr64
 156   };
 157
 158 extern const struct in6_addr in6addr_any;        /* :: */
 159 extern const struct in6_addr in6addr_loopback;   /* ::1 */
 160 #define IN6ADDR_ANY_INIT { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 }
 161 #define IN6ADDR_LOOPBACK_INIT { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 }
 162
 163 #define INET_ADDRSTRLEN 16
 164 #define INET6_ADDRSTRLEN 46
 165
 166 /* Get the definition of the macro to define the common sockaddr members.  */
 167 #include <sockaddrcom.h>
 168
 169
 170 /* Structure describing an Internet socket address.  */
 171 struct sockaddr_in
 172   {
 173     __SOCKADDR_COMMON (sin_);
 174     unsigned short int sin_port;        /* Port number.  */
 175     struct in_addr sin_addr;            /* Internet address.  */
 176
 177     /* Pad to size of `struct sockaddr'.  */
 178     unsigned char sin_zero[sizeof(struct sockaddr) -
 179                            __SOCKADDR_COMMON_SIZE -
 180                            sizeof(unsigned short int) -
 181                            sizeof(struct in_addr)];
 182   };
 183
 184 /* Ditto, for IPv6.  */
 185 struct sockaddr_in6
 186   {
 187     __SOCKADDR_COMMON (sin6_);
 188     u_int16_t           sin6_port;      /* Transport layer port # */
 189     u_int32_t           sin6_flowinfo;  /* IPv6 flow information */
 190     struct in6_addr     sin6_addr;      /* IPv6 address */
 191   };
 192
 193 /* IPv6 multicast request.  */
 194 struct ipv6_mreq
 195   {
 196     /* IPv6 multicast address of group */
 197     struct in6_addr ipv6mr_multiaddr;
 198
 199     /* local IPv6 address of interface */
 200     int         ipv6mr_ifindex;
 201   };
 202
 203
 204 /* Options for use with `getsockopt' and `setsockopt' at the IP level.
 205    The first word in the comment at the right is the data type used;
 206    "bool" means a boolean value stored in an `int'.  */
 207 #define IP_TOS             1    /* int; IP type of service and precedence.  */
 208 #define IP_TTL             2    /* int; IP time to live.  */
 209 #define IP_HDRINCL         3    /* int; Header is included with data.  */
 210 #define IP_OPTIONS         4    /* ip_opts; IP per-packet options.  */
 211 #define IP_MULTICAST_IF    32   /* in_addr; set/get IP multicast i/f */
 212 #define IP_MULTICAST_TTL   33   /* u_char; set/get IP multicast ttl */
 213 #define IP_MULTICAST_LOOP  34   /* i_char; set/get IP multicast loopback */
 214 #define IP_ADD_MEMBERSHIP  35   /* ip_mreq; add an IP group membership */
 215 #define IP_DROP_MEMBERSHIP 36   /* ip_mreq; drop an IP group membership */
 216
 217 /* To select the IP level.  */
 218 #define SOL_IP  0
 219
 220 /* Structure used to describe IP options for IP_OPTIONS. The `ip_dst'
 221    field is used for the first-hop gateway when using a source route
 222    (this gets put into the header proper).  */
 223 struct ip_opts
 224   {
 225     struct in_addr ip_dst;      /* First hop; zero without source route.  */
 226     char ip_opts[40];           /* Actually variable in size.  */
 227   };
 228
 229 /* Structure used for IP_ADD_MEMBERSHIP and IP_DROP_MEMBERSHIP. */
 230 struct ip_mreq
 231   {
 232     struct in_addr imr_multiaddr;       /* IP multicast address of group */
 233     struct in_addr imr_interface;       /* local IP address of interface */
 234   };
 235
 236 /* Functions to convert between host and network byte order.
 237
 238    Please note that these functions normally take `unsigned long int' or
 239    `unsigned short int' values as arguments and also return them.  But
 240    this was a short-sighted decision since on different systems the types
 241    may have different representations but the values are always the same.  */
 242
 243 extern u_int32_t ntohl __P ((u_int32_t __netlong));
 244 extern u_int16_t ntohs __P ((u_int16_t __netshort));
 245 extern u_int32_t htonl __P ((u_int32_t __hostlong));
 246 extern u_int16_t htons __P ((u_int16_t __hostshort));
 247
 248 #include <endian.h>
 249
 250 #if __BYTE_ORDER == __BIG_ENDIAN
 251 /* The host byte order is the same as network byte order,
 252    so these functions are all just identity.  */
 253 #define ntohl(x)        (x)
 254 #define ntohs(x)        (x)
 255 #define htonl(x)        (x)
 256 #define htons(x)        (x)
 257 #endif
 258
 259
 260 /* IPV6 socket options.  */
 261 #define IPV6_ADDRFORM           1
 262 #define IPV6_RXINFO             2
 263 #define IPV6_RXHOPOPTS          3
 264 #define IPV6_RXDSTOPTS          4
 265 #define IPV6_RXSRCRT            5
 266 #define IPV6_PKTOPTIONS         6
 267 #define IPV6_CHECKSUM           7
 268 #define IPV6_HOPLIMIT           8
 269
 270 #define IPV6_TXINFO             IPV6_RXINFO
 271 #define SCM_SRCINFO             IPV6_TXINFO
 272 #define SCM_SRCRT               IPV6_RXSRCRT
 273
 274 #define IPV6_UNICAST_HOPS       16
 275 #define IPV6_MULTICAST_IF       17
 276 #define IPV6_MULTICAST_HOPS     18
 277 #define IPV6_MULTICAST_LOOP     19
 278 #define IPV6_ADD_MEMBERSHIP     20
 279 #define IPV6_DROP_MEMBERSHIP    21
 280
 281 #define IN6_IS_ADDR_UNSPECIFIED(a) \
 282         ((((u_int32_t *)(a))[0] == 0) && ((u_int32_t *)(a))[1] == 0) && \
 283          (((u_int32_t *)(a))[2] == 0) && ((u_int32_t *)(a))[3] == 0))
 284
 285 #define IN6_IS_ADDR_LOOPBACK(a) \
 286         ((((u_int32_t *)(a))[0] == 0) && ((u_int32_t *)(a))[1] == 0) && \
 287          (((u_int32_t *)(a))[2] == 0) && ((u_int32_t *)(a))[3] == htonl(1)))
 288
 289 #define IN6_IS_ADDR_MULTICAST(a) (((u_int8_t *)(a))[0] == 0xff)
 290
 291 #define IN6_IS_ADDR_LINKLOCAL(a) \
 292         ((((u_int32_t *)(a))[0] & htonl(0xffc00000)) == htonl(0xfe800000))
 293
 294 #define IN6_IS_ADDR_SITELOCAL(a) \
 295         ((((u_int32_t *)(a))[0] & htonl(0xffc00000)) == htonl(0xfec00000))
 296
 297 #define IN6_IS_ADDR_V4MAPPED(a) \
 298         ((((u_int32_t *)(a))[0] == 0) && (((u_int32_t *)(a))[1] == 0) && \
 299          (((u_int32_t *)(a))[2] == htonl(0xffff)))
 300
 301 #define IN6_IS_ADDR_V4COMPAT(a) \
 302         ((((u_int32_t *)(a))[0] == 0) && (((u_int32_t *)(a))[1] == 0) && \
 303          (((u_int32_t *)(a))[2] == 0) && (ntohl(((u_int32_t *)(a))[3]) > 1))
 304
 305
 306 /* Bind socket to a priviledged IP port.  */
 307 extern int bindresvport __P ((int __sockfd, struct sockaddr_in *__sin));
 308
 309 __END_DECLS
 310
 311 #endif  /* netinet/in.h */